213231031073 has 2 divisors, whose sum is σ = 213231031074. Its totient is φ = 213231031072.

The previous prime is 213231030977. The next prime is 213231031147. The reversal of 213231031073 is 370130132312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211427075344 + 1803955729 = 459812^2 + 42473^2 .

It is a cyclic number.

It is not a de Polignac number, because 213231031073 - 2²² = 213226836769 is a prime.

It is a super-2 number, since 2×213231031073² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213231033073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615515536 + 106615515537.

It is an arithmetic number, because the mean of its divisors is an integer number (106615515537).

Almost surely, 2^213231031073 is an apocalyptic number.

It is an amenable number.

213231031073 is a deficient number, since it is larger than the sum of its proper divisors (1).

213231031073 is an equidigital number, since it uses as much as digits as its factorization.

213231031073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 26.

Adding to 213231031073 its reverse (370130132312), we get a palindrome (583361163385).

The spelling of 213231031073 in words is "two hundred thirteen billion, two hundred thirty-one million, thirty-one thousand, seventy-three".